牙轮的移轴距越大,牙轮的滑动量越小。
参考答案:错
解析:牙轮的移轴距越大,牙轮的滑动量越大。
Walking down the street the other day, _____.
A.I saw unusual something happened
B.a terrible accident happened
C.something unusual was seen by me
D.I saw a terrible accident
病毒感染的类型有几种,其分类依据是什么?